Benjamin Spock
From Memory Alpha, the free Star Trek reference
Doctor Benjamin Spock was a 20th century Human pediatrician.
In 2371, while the Doctor was looking for a name, Dr. Spock was one of the possible choices. (VOY: "Ex Post Facto")
Gene Roddenberry has denied rumors that he purposely used Dr. Spock's surname for his Vulcan character, Mr. Spock.
